Ionic Bonding
A sodium atom has 11 protons and 11 electrons. Which statement correctly explains why a sodium ion has a charge of 1+?
An element in Group 6 of the periodic table forms an ion. What is the charge on this ion?
Which formula correctly represents iron(III) sulfate?
A student writes the formula of calcium hydroxide as CaOH₂. Which of the following is the correct formula for calcium hydroxide?
In a dot-and-cross diagram for magnesium oxide, how many outer-shell electrons should be shown on the oxide ion (O²⁻) after electron transfer?
A student claims that when sodium chloride melts, the ionic bonds break and the ions turn back into atoms. Which correction is accurate?
Which of the following correctly represents the formula of ammonium carbonate?
Solid potassium bromide does not conduct electricity, but molten potassium bromide does. Which explanation is correct?
Magnesium oxide (MgO) has a much higher melting point (2,852 °C) than sodium chloride (NaCl, 801 °C). Which factor best explains this difference?
A dot-and-cross diagram for calcium chloride (CaCl₂) is drawn. How many electrons does the calcium atom transfer in total, and how are they distributed?
A chemistry student is asked to identify the charge carriers in three scenarios: a copper wire, molten sodium chloride, and solid sodium chloride. Which row is correct?
Which of the following is the correct formula for aluminium oxide?
An engineer is selecting a material to line the inside of a furnace that operates at 1,200 °C. The material must be electrically insulating at operating temperature. Why would magnesium oxide be suitable as a solid lining but problematic if it were to melt during operation?
Zinc sulfate is an ionic compound containing Zn²⁺ and SO₄²⁻ ions. What is the correct formula of zinc sulfate?
A student drawing a dot-and-cross diagram for NaCl shows all electron shells for both atoms, including inner shells. Which statement correctly identifies the problem with this approach?
A student dissolves potassium chloride in water and connects the solution to a circuit with a bulb. The bulb lights up. The student then evaporates all the water and tests the dry solid. The bulb does not light. Which explanation correctly accounts for both observations?
The copper(II) ion is Cu²⁺ and the nitrate ion is NO₃⁻. What is the correct formula of copper(II) nitrate?
Which statement correctly defines an ionic bond?